For touch screens or solar panels, the light transmittance of conductive coatings is better, so engineers often use transparent indium tin oxide (ITO) film as a development material, but the low cost and simple process are also practical products. Necessary elements According to a report from the Physicist Organization Network on August 8 (Beijing time), researchers from Brown University and Advanced Materials Inc. (ATMI) in the United States announced that they used a chemical solution to produce the most transparent indium tin oxide to date. Conductive film, simple technology, low cost, is expected to be favored by manufacturers.
The thickness of the conductive film is only 1 meter of 146 billion, and 93% of the light can be transmitted, and the transparency is comparable to glass. Researchers use flexible polyimide as a substrate, which means it has potential for application in flexible displays. "Our technology has reached the level of performance applied to resistive touch screens," said Li Zongxi, a graduate student in chemistry at Brown University.
The recently published "Journal of the American Chemical Society" describes this method of manufacture: Drop a solution containing indium tin oxide nanocrystals onto a rapidly rotating substrate to obtain a flat, smooth film. This process is called Cast for spin.
The researchers then annealed the coated panels to test the transparency and conductivity of the films. After several experiments, it has been found that the annealing duration is preferably 6 hours. Moreover, the thickness and tin content of the material (preferably between 5% and 10%) are changed, and the transparency and resistance are also changed. This will find the best combination of the two to develop the best performing conductive film. "By controlling the concentration of nanocrystalline solutions, we can control the thickness of the film between 30 nm and 140 nm," said Li Zongxi.
According to Sun Shouheng, the paper's lead author and professor at the Brown University's Department of Chemistry, the spin-casting process is not difficult. The breakthrough of this method lies in finding the right materials—indium indium acetylacetonate and acetylaceton chloride tin chloride to make indium tin oxide. Nanocrystals to produce high performance conductive films. The indium tin oxide nanocrystals they synthesize are extremely small and have a diameter of about 11 billionths of a meter. When the crystals align themselves on the film, they do not squash or travel too far. This dense but evenly distributed array of crystals helps to increase the conductivity of the film.
The author of the paper, Melissa Pietruska, a senior scientist at ATMI, said that the next step will be to increase the electrical conductivity of the indium tin oxide film by an order of magnitude by sputtering and to reduce costs and improve process efficiency. Therefore, the research team plans to further reduce the resistance in new experiments, shorten the annealing time, and use inkjet or roll-to-roll printing technology to produce a wide variety of films, not just continuous sheet-like films. (Reporter Chen Dan)
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